Zoom lens system, interchangeable lens apparatus, and camera system

A zoom lens and lens group technology, applied in the field of zoom lens system, can solve the problems of large size and heavy weight, and achieve the effect of compact size and good imaging performance

Inactive Publication Date: 2012-05-23
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Interchangeable-lens digital camera systems, despite all of the above advantages, are larger and heavier than compact digital cameras

Method used

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  • Zoom lens system, interchangeable lens apparatus, and camera system
  • Zoom lens system, interchangeable lens apparatus, and camera system
  • Zoom lens system, interchangeable lens apparatus, and camera system

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0061] The first lens group G1 includes in order from the object side to the image side: a negative meniscus first lens element L1 with a convex surface facing the object side, and a positive meniscus second lens element L2 with a convex surface facing the object side. The first lens element L1 is cemented with the second lens element L2.

[0062] The second lens group G2 includes in order from the object side to the image side: a negative meniscus third lens element L3 with a convex surface facing the object side, a biconcave fourth lens element L4, and a positive meniscus lens element L4 with a convex surface facing the object side The fifth lens element L5.

[0063] The third lens group G3 is composed of a negative meniscus sixth lens element L6 with a convex surface facing the image side.

[0064] The fourth lens group G4 includes in order from the object side to the image side: a biconvex seventh lens element L7, a biconvex eighth lens element L8, a biconcave ninth lens ...

no. 2 approach

[0066] The first lens group G1 includes in order from the object side to the image side: a negative meniscus first lens element L1 with a convex surface facing the object side and a biconvex second lens element. The first lens element L1 is cemented with the second lens element L2.

[0067] The second lens group G2 includes in order from the object side to the image side: a negative meniscus third lens element L3 with a convex surface facing the object side, a biconcave fourth lens element L4, and a biconvex fifth lens element L5 .

[0068] The third lens group G3 is composed of a negative meniscus sixth lens element L6 with a convex surface facing the image side.

[0069] The fourth lens group G4 includes in order from the object side to the image side: a biconvex seventh lens element L7, a biconvex eighth lens element L8, a biconcave ninth lens element L9, and a negative lens element with a convex surface facing the object side. The tenth lens element L10 having a meniscus...

no. 3 approach

[0071] The first lens group G1 is composed of a biconvex first lens element L1.

[0072] The second lens group G2 includes in order from the object side to the image side: a negative meniscus second lens element L2 with a convex surface facing the object side, a biconcave third lens element L3, and a biconvex fourth lens element L4 .

[0073] The third lens group G3 is composed of a biconcave fifth lens element L5.

[0074] The fourth lens group G4 includes in sequence from the object side to the image side: a biconvex sixth lens element L6, a biconvex seventh lens element L7, a negative meniscus eighth lens element L8 with a convex surface facing the image side, A negative meniscus ninth lens element L9 with a convex surface facing the object side, a biconvex tenth lens element L10 , and a negative meniscus eleventh lens element L11 with a convex surface facing the image side. The seventh lens element L7 is joined to the eighth lens element L8. In addition, both surfaces o...

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PUM

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Abstract

Disclosed is a compact, light-weight zoom lens system which can be used optimally in an interchangeable lens-type digital camera system and has excellent image resolution. The disclosed zoom lens system has, in order from the object side to the image side, a first lens group having positive power, a second lens group having negative power, a third lens group having negative power, and a fourth lens group having positive power and containing at least one resin lens, and an aperture block disposed in the fourth lens group. When zooming from the wide angle end to the telephoto end, the interval between the third lens group and the fourth lens group decreases monotonically. Further, condition 1: 1.0 4/fw 4: thickness in the optical axis direction of the fourth lens group, fw: focal distance of the whole system at the wide angle end).

Description

technical field [0001] The present invention relates to a zoom lens system, and more particularly to a zoom lens system suitable for a photographic lens system of a so-called interchangeable-lens digital camera system. In addition, the present invention also relates to an interchangeable lens device and a camera system using the zoom lens system. Background technique [0002] In recent years, interchangeable-lens digital camera systems have spread rapidly. An interchangeable-lens digital camera system (also referred to as "camera system") has a camera body and an interchangeable lens device. An image sensor such as an oxide semiconductor), the interchangeable lens device has a photographing lens system for forming an optical image on a light-receiving surface of the image sensor. In an interchangeable-lens digital camera system, an image sensor that is larger than that mounted in a compact digital camera is used. Accordingly, the interchangeable-lens digital camera system...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B15/20G02B13/18G03B5/00G03B17/14
CPCG03B17/14G02B13/18G02B15/173G02B15/144109
Inventor 吉永俊一郎泉原勇安达宣幸宫崎恭一
Owner PANASONIC CORP
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